Stop-valve.



No. 763,208. PATENTED JUNE-21, 1904.

, J. ROBINSON.

STOP VALVE APPLICATION FILED MARJIG. 1904.

N0 MODEL.

Patented June 21, 1904.

PATENT OFF CE.

JAMES ROBINSON, OF LEEDS, ENGLAND.

STOP-VALVE.

SPECIFICATION forming part of Letters Patent No 763,208, dated June 21,1904.

Application filed March 16, 1904.

To all whom it may concern.

Be it known that I, J AMES ROBINSON, a subject of the King of GreatBritain, residing at Leeds, in the county of York, England, haveinvented certain new and useful Improvements in Stop-Valves, of whichthe following is a specification.

This invention relates to stop-valves for steam, gas, compressed air,water, or other fluids of that type in which a valve of cylindricalformation carried on the lower endof a screwed spindle is caused toengage against an annular upturned rim or seating formed on thevalve-casing; and my object is to construct a stop-valve in such amanner as to in sure a perfectly-sealed joint between the valve and itsseating when under pressure. To this end I employ a valve body or casinghaving an annular rim or seating and being provided with a screwedvalve-actuating spindle of ordinary construction, while the valve properis formed in two parts, consisting of an upper or outer portion, whichis loosely carried on the lower end of the valve-spindle, and a lower orinner portion, which is loosely carried on the said upper portion. Thetwo portions comprising the valve proper are formed withoppositely-situated beveled faces, which are adapted to engagecorresponding oppositelysituated beveled faces on the annular upturnedrim or seating of the valve body or casing, and the said valve portionsare so arranged in connection with each other as to form an annularchamber within the valve itself, which chamber is fitted with anasbestos or any other suitable elastic or soft packing-ring adapted toengage a portion of the seating on the valvebody between theoppositely-situated beveled faces, while apertures are formed throughthe lower portion of the valve, so as to establish communication betweenthe annular chamber above the packing-ring and the interior of thevalve-casing. When the valve is closed on its seat, the steam or otherfluid under pressure contained in the pipe or vessel to which the valveis attached enters the annular chamber through the apertures in thevalve and presses upon the packing ring contained therein, which has theeffect of forcing the said ring down onto the seating of the valve-casing with Serial No. 198,347. (No model.)

a force in proportion to the area of the said ring and the pressurewhiehthe valve has to withstand, thereby sealing the valve againstleakage. Ifv desired, a ring of hard metal may be inserted above theelastic or soft packing in the annular chamber of the valve, so as toact after the manner of an annular piston to force the soft packing-ringdown onto its seating, thereby sealing the complete valve againstleakage and at the same time protecting the said packing-ring againstinjury from the action of the steam or other fluid.

In order that my invention may be clearly understood, I will proceed todescribe the same with reference to the accompanying drawing, whichshows in sectional elevation a stop- Valve constructed in accordancewith my invention in which the numbers of reference marked thereoncorrespond with the numbers occurring in the following description:

In the drawing, 1 is the valve body or casing, having an annularupturned rim or seating 2, and 3 is the screwed valve-actuating spindleof ordinary construction. The valve proper, which is rotatably mountedon a fixed collar 4:, located on the lower end of the valve-spindle 3,is formed in two parts, consisting of an upper metallic body portion 5,having an outer depending circular rim 6 and a central depending spindle7 formed integral therewith, and a lower or inner metallic portion 8,having an upturned rim 9 formed integral therewith, the said port-ion 8being mounted on the central spindle 7 of the portion 5 and held looselythereon by means of a pin 10. The depending circular rim 6 of theportion 5 of the valve is formed with an internal recess 11, while thelower edge of the said rim 6 is formed with a beveled face 12, adaptedto engage a corresponding beveled face 13, formed on the annularupturned rim or seating 2 of the valve body or casing 1, and the innerportion 8 of the valve is formed with a beveled face 1 1, locatedopposite the recessed rim 6, and a second or oppositely-situated beveledface 13 is formed on the valve portion 8, adapted to engage acorresponding beveled face 16, formed on the annular upturned rim orseating 2 of the valve body or casing 1. An annular chamber is thusformed between the rims 6 and 9 of the valve, in which chamber anasbestos or other suitable elastic or soft packing-ring 17 is fitted, soas to engage a portion of the seating 2 on the valve body or casing 1between its oppositely-situated beveled faces 13 and 16, and above theelastic or soft packing 17 within the recess 11 is inserted a hard-metalring 18, while apertures 19 are formed through the lower portion 8 ofthe valve, so as to establish communication between a pressure-chamber20, formed within the valve itself above the packing-ring, and theinterior of the valve-casing 1. On screwing down the valve-spindle 3 thebeveled face 15 on the inner portion 8 of the valve comes onto itscorresponding beveled face 16 on the seating 2 and simultaneouslytherewith the beveled face 12 on the outer portion 5 of the valve comesonto its corresponding beveled face 13 on the seating 2, when the entirevalve comes to rest and cannot be screweddown any lower. The steam orother fluid under pressure contained in the pipe or vessel to which thevalve is attached then enters the chamber 20 of the valve by way of theapertures 19 and presses upon the upper surface of the annular ring 18of the elastic or soft packing 17, which has the effect of forcing thesaid packing down onto the seating 2 of the valve-casing 1 automaticallywith a force equal to the pressure which the valve has to withstand,thereby'efieetuallysealing the valve against leakage.

By employing the hard-metal ring 18 above the elastic or soft packingring 17 the latter is effectually protected against injury from theaction of the steam or other fluid.

What I claim as my invention, and desire to secure by Letters Patent, is

In a stop-valve, the combination with a valve body or casing having anannular upturned rim or seating, and a valve-actuating spindle; of avalve proper consisting of an upper portion carried loosely on thevalvespindle and having an outer depending circular rim formed with abeveled face adapted to engage a corresponding beveled face formed onthe annular seating of the valve-casing, and a lower or inner portioncarried loosely by the said upper portion formed with a beveled faceadapted to engage a corresponding beveled face formed on the annularseating of valve-casing, said inner portion having an upturned rimforming in conjunction with the depending rim of the upper portion anannular chamber containing a packing-ring adapted to engage against theseating of the valveeasing, and a pressure-chamber formed Within thevalve itself above the packing-ring communicating with the interior ofthe valve-casing, substantially as and for the purposes set forth.

JAMES ROBINSON. WVitnesses:

JOHN J own'rcr, VANCE E. GALLowAY.

